How many Simultaneousness call over 1 SIP Trunk

Hi,

I want to know how many simultaneousness calls I can have over 1 SIP Trunk ?
Is a SIP trunk similar to an E1 ISDN Pri trunk where i get 30 channels, do i get so many channels per SIP trunk ?

Thanks,
-P-HendersonAsked:
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jfaubiontxCommented:
This depends on the SIP provider and the service plan. While there is no hard limit by the standard, most providers limit the number of calls in an effort to reduce system load and bandwidth usage. Plans with "unlimited" calling typically have the fewest channels while the pay per minute plans allow more channels. Most SIP providers will list the number of available channels in the details on the plan.  
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-P-HendersonAuthor Commented:
So in theory 1 SIP trunk can contain unlimited RTP calls, only limited by the bandwidth of the link ?
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José MéndezCommented:
That is correct. A SIP Trunk is more of a concept, not like a PRI where you actually have physical trunk or cable that bundles those 30 or 23 concurrent calls. You can think of a SIP trunk as a place where to send calls, an IP.

Your provider will drop excessive calls, so your devices won't send RTP traffic.
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-P-HendersonAuthor Commented:
Thanks guys
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-P-HendersonAuthor Commented:
Just one more question !!!

Say we have 1x sip trunk with 5x voice channels running over it.
do i have 1x sip session running which looks after all 5x calls or do i have a separate sip session for each call ?

Just trying to work out SIP in more detail.
Thanks,
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jfaubiontxCommented:
There is a seperate session per call. You will only have one SIP registration. Also keep in mind that while the number of sessions is  theoretically limited to the number of UDP ports, there are obviously practical limits based on the available bandwidth. Each session will use between 10-80 kbps depending on the codec choosen. G.711 has the least compression and typically the best voice quality but the highest bandwidth utilization. Codecs like GSM and g.729 are a compromise between voice quality and bandwidth. That being said, using DSL with 384k upload speed and g.711u you'll be lucky to have 3-4 calls. Use FIOS with 25m/25m service and you can probably have more calls than you want to buy hardware for.
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-P-HendersonAuthor Commented:
Thanks guys, really helpfull
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